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Supplementary Balance Sheet Detail
 12 Months Ended
Dec. 31, 2015
Balance Sheet Related Disclosures [Abstract]  
Supplementary Balance Sheet Detail
Supplementary Balance Sheet Detail

The following tables present supplementary balance sheet details:
 
At December 31,
2014
 
2015
 
(Dollars in thousands)
 
 
 
 
Inventories:
 
 
 
   Raw materials and supplies
$
122,218

 
$
80,408

   Work in process
176,141

 
136,858

   Finished goods
84,544

 
78,196

 
382,903

 
295,462

Prepaid expenses and other current assets:
 
 
 
   Prepaid expenses
$
9,923

 
$
9,297

   Current portion of deferred taxes
28,426

 
—

   Value added tax and other indirect taxes receivable
39,837

 
10,087

   Other current assets
3,437

 
2,290

 
$
81,623

 
$
21,674

Property, plant and equipment:
 
 
 
   Land and improvements
$
36,375

 
$
54,064

   Buildings
193,427

 
76,331

   Machinery and equipment and other
1,212,120

 
486,194

   Construction in progress
58,899

 
44,291

 
$
1,500,821

 
$
660,880

Other accrued liabilities:
 
 
 
   Payrolls (including incentive programs)
$
6,151

 
$
4,588

   Customer prepayments
5,534

 
559

   Employee compensation and benefits
8,932

 
7,842

   Other
22,702

 
16,790

 
$
43,319

 
$
29,779

Other long term obligations:
 
 
 
   Postretirement benefits
$
24,833

 
$
20,019

   Pension and related benefits
65,882

 
55,364

   Other
16,851

 
20,102

 
$
107,566

 
$
95,485


The following table presents an analysis of the allowance for doubtful accounts:
 
As of December 31,
 
For the Period January 1 through
August 14, 2015
 
For the Period August 15 through
December 31, 2015
2013
 
2014
 
 
 
(Dollars in thousands)
Balance at beginning of year
$
7,573

 
$
6,718

 
$
7,471

 
$
—

Additions
2,914

 
8,675

 
1,156

 
304

Deductions
(3,769
)
 
(7,922
)
 
(2,313
)
 
—

Balance at end of year
$
6,718

 
$
7,471

 
$
6,314

 
$
304